Answer:
Oxides of Nitrogen (NOx)
NOx is a collective term used to refer to two species of oxides of nitrogen: nitric oxide (NO) and nitrogen dioxide (NO2).
Annual mean concentrations of NO2 in urban areas are generally in the range 10-45 ppb (20-90 µgm-3). Levels vary significantly throughout the day, with peaks generally occurring twice daily as a consequence of "rush hour" traffic. Maximum daily and one hourly means can be as high as 200 ppb (400 µgm-3) and 600 ppb (1200 µgm-3) respectively.
Globally, quantities of nitrogen oxides produced naturally (by bacterial and volcanic action and lightning) far outweigh anthropogenic (man-made) emissions. Anthropogenic emissions are mainly due to fossil fuel combustion from both stationary sources, i.e. power generation (21%), and mobile sources, i.e. transport (44%). Other atmospheric contributions come from non-combustion processes, for example nitric acid manufacture, welding processes and the use of explosives.
Sulphur Dioxide (SO2)
SO2 is a colourless gas. It reacts on the surface of a variety of airborne solid particles, is soluble in water and can be oxidised within airborne water droplets.
Annual mean concentrations in most major UK cities are now well below 35 ppb (100 µgm-3) with typical mean values in the range of 5-20 ppb (15-50 µgm-3). Hourly peak values can be 400-750 ppb (1000-2000 µgm-3) on infrequent occasions. Natural background levels are about 2 ppb (5 µgm-3).
The most important sources of SO2 are fossil fuel combustion, smelting, manufacture of sulphuric acid, conversion of wood pulp to paper, incineration of refuse and production of elemental sulphur. Coal burning is the single largest man-made source of SO2 accounting for about 50% of annual global emissions, with oil burning accounting for a further 25-30%.
Carbon Monoxide (CO)
Carbon Monoxide is a colourless, odourless, tasteless gas that is slightly lighter than air.
Natural background levels of CO fall in the range of 10-200 ppb. Levels in urban areas are highly variable, depending upon weather conditions and traffic density. 8-hour mean values are generally less than 10 ppm (12 mgm-3) but have been known to be as high as 500 ppm (600 mgm-3).
CO is an intermediate product through which all carbon species must pass when combusted in oxygen (O2). In the presence of an adequate supply of O2 most CO produced during combustion is immediately oxidised to carbon dioxide (CO2). However, this is not the case in spark ignition engines, especially under idling and deceleration conditions. Thus, the major source of atmospheric CO is the spark ignition combustion engine. Smaller contributions come from processes involving the combustion of organic matter, for example in power stations and waste incineration.
Ozone (O3)
O3 is the tri-atomic form of molecular oxygen. It is a strong oxidising agent, and hence highly reactive.
Background levels of O3 in Europe are usually less than 15 ppb but can be as 100 ppb during summer time photochemical smog episodes. In the UK ozone occurs in higher concentrations during summer than winter, in the south rather than the north and in rural rather than urban areas.
Most O3 in the troposphere (lower atmosphere) is formed indirectly by the action of sunlight on nitrogen dioxide - there are no direct emissions of O3 to the atmosphere. About 10 - 15% of tropospheric O3 is transported from the stratosphere where it is formed by the action of ultraviolet (UV) radiation on O2. In addition to O3, photochemical reactions involving sunlight produce a number of oxidants including peroxyacetyl nitrate (PAN), nitric acid and hydrogen peroxide, as well as secondary aldehydes, formic acid, fine particulates and an array of short lived radicals. As a result of the various reactions that take place, O3 tends to build up downwind of urban centres where most of NOx is emitted from vehicles.
Explanation:
The MSDS for benzene indicates that it is a clear liquid that has a substantial vapor pressure. It has a health rating of
2, a fire rating of 3, and a reactivity rating of 0. It is a cancer-causing agent.
Based on this information, which siatement about benzene is accurate?
Benzene readily reacts with moist air.
Benzene explodes if the container is shaken.
Benzene must be kept away from flames.
Benzene must be stored under high pressure.
Based on the provided information, the statement that is accurate about benzene is that it must be kept away from flames. This is because benzene has a high flammability rating of 3, which indicates that it can ignite and burn easily.
Additionally, the MSDS states that benzene has a substantial vapor pressure, which means it can easily evaporate into the air and form flammable mixtures with air.
The other statements are not accurate. Benzene does not readily react with moist air or explode if the container is shaken. It also does not need to be stored under high pressure. However, benzene is a cancer-causing agent, so it is important to handle it with care and follow proper safety precautions.
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yo someone please help meee The density of silver is 10.5 g/cm3. What is the mass (in kilograms) of a cube of silver that measures 0.69 m on each side?
Mass of the cube of silver is 3,449.34 kg
First find the volume of the cube in centimeters because the density is in centimeters:
0.69 * 100 = 69 centimeters
Volume = Side * Side * Side
= 0.69 x 0.69 x 0.69
= 328,509 cm³
The density of a material is calculated by the formula:
= Mass / Volume
As you have the density already and the volume, you can get the mass:
10.5 = Mass / 328,509
Mass = 10.5 * 328,509
= 3,449,344.50 grams
A kilogram is 1,000 grams so the mass in kg is:
= 3,449,344.50 / 1,000
= 3,449.3445 kilograms
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Which statement best describes how the use of gasoline in a car relates to the discipline of chemistry?
The materials used come from the ground,
The gasoline undergoes a change as it burns
A car uses the gasoline to move
All parts of the car are composed of chemicals.
Answer:
The gasoline undergoes a change as it burns.
Explanation:
Just took the Unit Test review ((:
Answer:
b
Explanation:
because i said so brudda
a 1 mL pipette delivers a measured volume of .98 mL (calculate the percentage error)
Answer:
2%
Explanation:
.98 is 98% of one and therefore they are missing 2%
Answer:
2%
Explanation:
The answer is 2%.
100-98 is 2.
How do you do a one pager online!?!?!
I couldn’t find science so I just chose chemistry
True or false: Only liquids can be described as fluids. I NEEED HELPP NOWWW
Answer:
Explanation:
no, as it can also be used to describe a gas- a fluid includes liquids, gases and plasms
Why do atoms always contain the same number of electrons and protons?
Answer:
An electron is a negatively charged subatomic particle and a proton is a positively charged subatomic particle. Positive charge(s) attract negative charge(s) and vice versa. The proton and neutron stay together and attract one another to give the atom an overall charge of zero (neutral). Which is the charge of an atom. When there is an unequal number of protons and neutrons an ion is formed. If the number of protons are more than the electron, a positively charged ion called cation is formed. On the other hand, if the number of electrons are more than the protons a negatively charged ion called anion is formed.
Answer:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral. ... Chemically, we say that the atoms have formed bonds.
Explanation:
When exposed to very high temperatures, metals like iron can be turned into fluids that flow and can be poured into molds. What happens within the iron to allow it to flow?
Answer: the particle vibrate
!
A kilometer is much greater in distance then a millimeter true or false
Answer:
true
Explanation:
Answer:
true
because if you look at a chart it will lable
kilometercentimetermillimeterand so onQuestion 3 of 10
Which of the following elements shows little reactivity?
A. Potassium (K)
B. Sulfur (S)
C. Fluorine (F)
O D. Argon (Ar)
Answer: Correct answer is
Ar- Argon
Explanation:
A P E X :)
If the weather map above is from today’s forecast, which city is most likely to see its temperatures rise tomorrow?
Chicago
Houston
Denver
Memphis
Answer:
The awnser is chicahgo
Explanation:
(01.01 MC)
Which of the following could be considered a scientific statement
Answer:
hmmmm not sure and don't know
Explanation:
If a gas has a mass of 468 grams and its density is 17 grams per liter, how much volume does it occupy?
Answer:
The answer is
27.53 LitresExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{Density} [/tex]
From the question
mass = 468 g
Density = 17 g/L
Substitute the values into the above formula and solve
We have
[tex]volume = \frac{468}{17} \\ = 27.529411[/tex]
We have the final answer as
27.53 LHope this helps you
What is the answer 24.3m
what provides the energy needed to fuel the water cycle
Answer:
Sunlight provides the energy
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide?
Answer:
the answer is A :)
Explanation:
Mass is usually measured in grams and
What does the atomic mass come from on the periodic table?
The atomic mass comes from isotopes on the periodic table.
Shreya spent $16 on a magazine and some
erasers. If the magazine cost $7 and each
eraser cost $3, then how many erasers did
she buy?
Answer:
she bought 3 erasers an got two dollars back
Explanation:
Consider the electron configuration. A box holds an up and a down arrow. A box holds an up and a down arrow. A box holds an up and a down arrow.A box holds an up and a down arrow.A box holds an up and a down arrow. A box holds an up and a down arrow. A box holds an up and a down arrow.A box holds an up and a down arrow.A box holds an up arrow. 1s 2s 2p 3s 3p Which element has this electron configuration? astatine bromine chlorine fluorine
Answer:
Chlorine
Explanation:
Each arrow represents one electron. Most of the boxes are filled, meaning they have two electrons. The last box only has one arrow, so it only has one electron. If you add it up, you get 17, which is Chlorine.
How do protons, neutrons, and electrons differ in terms of their electrical charges and
locations within the atom?
Answer:
Protons and Neutrons are large particles and are densely compacted into the nucleus of the atom. Protons are electrochemically positive in charge and the Neutrons are electrochemically neutral in charge. ... Electrons are electrochemically negatively charged particles that move random around the nucleus
Explanation:
Protons are positively charged, neutrons are neutral and they both are located in the nucleus whereas electrons are negatively charged and located outside the nucleus.
Explanation:
Atom is defined as the smallest unit of a matter.It consists of three subatomic particles: protons, neutrons, electrons.Protons and neutrons are located inside the nucleus. They are also known as nucleonsElectrons are located outside the nucleus.Protons carry a positive charge, electrons carry a negative charge, and neutrons carry no charge (neutral).So from this, we conclude that the protons are positively charged, neutrons are neutral and they both are located in the nucleus whereas electrons are negatively charged and located outside the nucleus
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Why are some isotopes radioactive and some are not?
Answer: there are atoms that either have too many or too few neutrons or protons in their nuclei. This results in an imbalance between the jedi forces holding them together, which leads to an excess of internal energy. Such atoms are said to be unstable or radioactive.
Explanation:
which is the odd one out of clay pot , chalk , steel spoon and glass bowl(with explanation)
Answer:
chalk
Explanation:
most of them are utensils
Hail is an example of which type of phase change?
A) Sublimation
B) Evaporation
C) Condensation
D) Freezing
Answer:
D) freezing
Explanation:Because hail sounds like it is hard and hail comes down and it hurts because it is freezing.
The hail can be defined as the conversion of the water to the ice. Thus, hail is an example of freezing.
What is phase change?The phase can be defined as the state of the matter. With the change in the temperature and the pressure values, the state of the matter, or the phase changes.
The hail has been the solid precipitation of the rain water. With the lowering of the temperature to the critical pressure, the water converts to ice.
The conversion of water to ice has been termed as freezing, Thus, hail is an example of freezing. Hence, option D is correct.
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The sum of the number of protons and neutrons in an atom is called the ________ of the element. 1. Molar Mass 2. Atomic number 3. Average atomic mass 4. Mass number
o2 o4 o3 o1
Answer:
The sum of the number of protons and neutrons in an atom is called the Mass number.
Which are different forms of an element that have different numbers of neutrons?
O ions
O isotopes
O compounds
O molecules
I need help pleaseeee
who can answer questions 5 and 6
I have no clue on what to do
Answer:
A.
Explanation
Because it is totally irrelevant to what the question is asking.
What is the application of Complexometric titration?
Explanation:
Complexometric titration (sometimes chelatometry) is a form of volumetric analysis in which the formation of a colored complex is used to indicate the end point of a titration. Complexometric titrations are particularly useful for the determination of a mixture of different metal ions in solution.
hope it will help u ✌️
Find the force if the mass is 6 kg and the acceleration is 12 m/s/s?
Answer:
72 Newton
Explanation:
force=mass x acceleration due to gravity
Force applied on object is 72 Newton
Given that;
mass of thing = 6 kg
Acceleration = 12 m/s²
Find:
Force applied on object
Computation:
Force = mass × acceleration
Force applied on object = 6 × 12
Force applied on object = 72 Newton
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